摘要
对比研究了乳清酸和异乳清酸对某些稀土离子特征荧光的增敏情况 ,发现异乳清酸比乳清酸更有效地使Eu3+ 、Tb3+ 、Dy3+ 的特征荧光增敏。建立了乳清酸 异乳清酸体系荧光法测定Eu3+ 、Tb3+ 、Dy3+ 的新方法 ,在乳清酸体系中Eu3+ 、Tb3+ 的检出限分别是 0 .73、0 .0 65mg L ,在异乳清酸体系中Eu3+ 、Tb3+ 、Dy3+ 的检出限分别是 0 .88、0 .0 0 2 3、0 .5 9mg L。该方法用于混合稀土氧化物中Eu3+ 、Tb3+ 、Dy3+ 含量的测定 。
The fluorescence properties of Eu3+, Tb3+ and Dy3+ complexed with orotic or isoorotic acid were investigated. It was found that isoorotic: acid had larger sensitization for the fluorescence intensities of Eu3+, Tb3+ and Dy3+ than orotic acid. Based on this, a new method for the detection of Eu3+, Tb3+ and Dy3+ was established. The optimal conditions of. fluorimetric determination of Eu3+, Tb3+ and Dy3+ were : pH 8.0, 1.75 x 10(-3) mol/L orotic acid or 1.0 x 10(-3) mol/L isoorotic acid. In orotic acid system, the detection limits of Eu3+ and Tb3+ were 0.73 and 0.065 mg/L, respectively; and linear ranges between the fluorescence intensities and concentrations of Eu3+ and Tb3+ were 0.80 similar to 8.00 and 0.07 similar to 5.00 mg/L, respectively. In isoorotic acid system, the detection limits of Eu3+ Tb3+ and Dy3+ were 0.88, 0.0023 and 0.59 mg/L, respectively; and linear ranges of Eu3+, Tb3+ and Dy3+ were 1.00 similar to 8.00, 0.003 similar to 3.00 and 0.70 similar to 10.00 mg/L, respectively. With isoorotic acid, the detection limit of Tb3+ was 27. 3 times lower than that with orotic acid. The content of Eu2O3, Tb4O7 and Dy2O3 in mixture of rare earth oxides was successfully determined by the proposed method.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2003年第9期1079-1081,共3页
Chinese Journal of Analytical Chemistry
